Reinforcing-back for brake-shoes.



1. Hoffma. ,RElNFDR'ClNG BACK FORBRKE SHOES.

mmm De@ 19,1916.

APPLICATION Juno me. laf was.

Y f moans fj;

CORPORATION OF DELAWARE.

'Ef-.- FHNE, 0F NEW YRK, if. Y., ASSEGNGR, El? MESHE fLSSG-NQEENTS, T0 AMERICAN BRAKE SHOE & EOUNDRY COMPANY, OE WILMINGTON, DELAWARE, .di

Specification of Lettcrsfatent.

Patented Dec. t9, 119116.

Application flied .august 16, 3.91.5 Serial No. ndert.

To all lwhom t may concern.'

Be it known that l, loHN Horrrrlnn, a citizen of the United States, and a resident of New York city, borough of Manhattan,

in the county of New York and State of New York, have made and invented certain new and useful improvements in Reinforc ing-Backs for Brake-Shoes, of which the following is a specification.

This invention relates to brake shoes and concerns in particular the reinforcing back therefor, the object of the invention being to provide a reinforcing back which is both strong and rigid and reinforced along its side edges, so that when the saine is incorporated in thebody of the shoe, it provides great stiffness and ri idity therefor, and renders the same capa le of withstanding such strains and shocks as are incident to the use of the shoe.

lt has heretofore been the practice in forming channel or bridged backs for brake shoes, to flange the edges thereof and turn the same toward the wearing face of the shoe. The foregoing oftentimes resulted in the cutting of the tread of the wheel by cony tact with these flanged edges after the body of the shoe had been nearly worn away. The foregoing limited the extent to which the body could be worn away and materially increased the weight of the scrapped shoe. In order to overcome these disadvantages, l I provide a reinforcing back, with the longitudinal edges thereof flanged in a direction away from the wearing .face of the shoe body. "The shoe body may, accordingly, be worn completely through without danger of the flanged edges coming into contact with the tread of the wheel, and the further fea- 4o ture is obtained that the outwardly turned flanged edges are normally subjected to cornpression rather than tension, the characteristics of the metal which is used for reinforcing. backs being such that the -flanged edges are more efficient when subjected to compressive strains. Other objects and advantagesy of my improved brake shoe back will ap ear as the description proceeds, wherein itl is to be understood that changes in the precise embodiment of my invention can be made within the scope of what is claimed without departing from the spirit thereof.

The preferred embodiment of my inven tion is disclosed in the accompanying drawings, wherein Figure l is a view in plan of the blank from which my improved back is formed. Fig. 2 is a view in perspective of the finished back, the same embodying the characteristic features of my invention. Fig'. 3 is a fragmental view in perspective of my improved back, illustrating the manner irl which the lug is attached thereto. Fig. 4C is a view in transverse section of my improved back incorporated in the body of the shoe. is a similar view of a slightly modified form of back, the modification residing inthe complete turning and crimping of the flanged edges of the shoe. F ig. 6 is a view in side section of a slightly modified form of reinforcing back. In this instance, the central portion of the back is upwardly crimped so as to receive the toes of the securing lug therebeneath and prevent their projection below the common plane of the back. Fig. 7 is a view in transverse section of the same, the section being taken through the lug of the shoe.

Referring specifically to the several views, the blank, as illustrated in Eig. 1, comprises the oblong body 10, and the flange forming portions 11, these portions extending from opposite sides of the body 10 and extending in the length thereof. rlhese flange forming portions do not extend the entire length of the body, but preferably stop short of the ends thereof, as the stidening and reinforcing of the ends of the back are not essential. The blank is provided with the elongated openings B, which, in the nished or completed back, allow the cast metal of the body to flow up therein so as to increase the anchorage therefor. Slots 14 are formed in the body l0 of the blank, and are located sym metrically about the medial line thereof, these slots accommodating the ends of the lug and providing for the securement of the two. The blank is bent in the direction of its length so as to form the finished or completed back illustrated in Fig. 2, and the` flange forming portions 11 are bent away from the concave surface thereof, which corresponds to the working face of the shoe body. The flanges il', as thus formed, eX- tend above the convex face of the back and impart a high degree ofstrength and rigid ity thereto. rllhe flanges 11 extending, as

Fig. 5

:mei l they do, away from the working face 13 of the body l) of the shoe, do not in any way interfereA with the complete wearing away of the shoe body, and are so disposed that they are prevented from contacting with and injuring the tread of a car wheel even after the body of the shoe becomes completely worn through.

Prior to the Casting of the body 12 upon the shoe bach, I secure a lug 16 to the back by tucking or bending the toes 16 of the lug through and beneath the recesses 14 and into contact with the lower surface of the back. rllhe cast metal of the body flows above and around the lug 16, and supplements the same. `T he turning of the flanges 11 away from the wearing face of the shoe body provides that during the actual use of the shoe, the said flanges will be subjected to compressional strains, and which they are particularly adapted to withstand, the characteristics of the metal of which the back is formed being such that the flanges are more eflicient in compression than in tension. The upward turning of the flanges of the back define a channel or bridged back of marked strength and rigidity, and providing for the small weight of the shoe when scrapped.

The somewhat modified form of back illustrated in F ig. 5 has the anged edges thereof bent or crimped down upon the back so as to contact therewith and form ribs 17, such changes coming clearly Within the scope of my invention. A somewhat further modification is disclosed inrFigs. 6

. and 7, wherein the portion 18 of the reinforcing back, which lies between the openings 14, is upwardly or outwardly crimped, so as to receive the toes 15 therebeneath and prevent their protrusion below the general plane ot the back. rlhis slight crimping of ing outward `from the the back does not in any way weaken the saine, and at the same time it avoids any likelihood of the toes of the lug being worn away and the lug severed from the back.

A, VVhatI claim is:

1. A back for brake shoes comprising a body with flanged edges, said flanges extendconvex face of said body and being bent into contact therewith to define ribs extending along the top surface of said shoe back.

2. A back for brake shoes comprising a plate curved in its length, the central portion of said plate provided with means for anchoring the toes of a lug thereto, the said means being removed from the side edges of said plate, and flanges formed at the side edges of said plate and projecting above the convex surface thereof.

3. A back for brake shoes comprising a plate curved in its length, the central portions of said plate provided with means for anchoring the toes of a lug thereto, the said means being removed from the side edges of said plate, and continuous flanges formed at the side edges of said plate and projecting above the convex surface thereof.

4. A back for brake shoes consisting of a steel plate curved in itslength and provided with continuous ribs the convex surface, the central portion of said plate, intermediate said ribs, provided with spaced slots therein, and a lug with the toes anchored in the said slots.

Signed at New York, in the county of New York and State of New York, this Zth day of August, A. D. 1915.

, JHN HOFFHNE.

Witnesses:

FRED A. KUNEMUND, JOHN Coon.

projecting above 

